Retractable utility knife



FIG. 1 is a front view of a retractable utility knife showing my newdesign;

FIG. 2 is a top view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in FIG. 2 illustrate a portion of the retractableutility knife that forms no part of the claimed design.

The ornamental design for the retractable utility knife, as shown and described. 